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Pension and other PostRetirement Benefits (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 CAD ($) Y	Dec. 31, 2017 CAD ($) Y
Minimum
Pension and other PostRetirement Benefits,
Annual contribution (as a percent)	5.00%
Maximum
Pension and other PostRetirement Benefits,
Annual contribution (as a percent)	11.50%
Defined benefits pension plans
Change in benefit obligation
Disposal (note 33)		$ (69)
Experience (gain) loss arising on plan liabilities	$ 26	(2)
Defined benefits pension plans | Obligations
Change in benefit obligation
Benefit obligation at beginning of year	6,717	6,280
Obligations acquired through acquisition (note 31)	185
Current service costs	235	193
Plan participants' contributions	15	14
Benefits paid	(296)	(294)
Interest costs	236	236
Foreign exchange	14	(2)
Settlements	5	7
Experience (gain) loss arising on plan liabilities	(26)	2
Actuarial gain arising from changes in demographic assumptions	(1)	(4)
Actuarial (gain) loss arising from changes in financial assumptions	(354)	354
Benefit obligation at end of year	6,730	6,717
Defined benefits pension plans | Plan assets
Change in benefit obligation
Benefit obligation at beginning of year	(5,799)	(5,356)
Obligations acquired through acquisition (note 31)	153
Employer contributions	182	160
Plan participants' contributions	(15)	(14)
Benefits paid	273	269
Interest costs	(201)	(200)
Disposal (note 33)		71
Foreign exchange	(14)	3
Settlements	(5)	(7)
Administrative costs	2	2
Return on plan assets (less than) greater than discount rate	(299)	407
Benefit obligation at end of year	(5,795)	(5,799)
Net unfunded obligation	(935)	(918)
Defined benefits other post retirement benefits
Change in benefit obligation
Disposal (note 33)		(9)
Experience (gain) loss arising on plan liabilities	18	12
Defined benefits other post retirement benefits | Obligations
Change in benefit obligation
Benefit obligation at beginning of year	597	587
Obligations acquired through acquisition (note 31)	8
Current service costs	13	14
Benefits paid	(23)	(21)
Interest costs	21	22
Foreign exchange	1	(1)
Experience (gain) loss arising on plan liabilities	(18)	(12)
Actuarial gain arising from changes in demographic assumptions		(9)
Actuarial (gain) loss arising from changes in financial assumptions	(42)	26
Benefit obligation at end of year	557	597
Defined benefits other post retirement benefits | Plan assets
Change in benefit obligation
Net unfunded obligation	$ (557)	$ (597)
Pension and Other Post Retirement Benefits | Canada
Change in benefit obligation
Percentage of net unfunded obligations	60.00%	67.00%
Pension and Other Post Retirement Benefits | Canada | Weighted average
Change in benefit obligation
Weighted average duration of defined benefit obligation | Y	13.70	13.91

X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)]

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

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The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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- Definition

The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

+ References

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The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

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The effect on the net defined benefit liability (asset) of expenses related to defined benefit plans that the entity classifies as being administrative.

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Percentage employer matches of the employee's percentage contribution matched.

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The increase (decrease) in the net defined benefit liability (asset) resulting from disposals.

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The percentage of net unfunded obligation.

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Return on plan assets greater than discount rate.

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